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https://github.com/ryan4yin/nix-config.git
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Ryan Yin
5c9bb6f95f
NixOS's libvirtd-config copies default.xml but never creates its autostart link, and shoryu has no networks/autostart directory at all, so virbr0 never starts and the oneshot had nothing to disable. Assisted-by: Claude Code (claude-opus-5-5)
67 lines
2.0 KiB
Nix
67 lines
2.0 KiB
Nix
{
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pkgs,
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lib,
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mylib,
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...
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}:
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let
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genXml = import (mylib.relativeToRoot "lib/genLibvirtDomainXml.nix") { inherit lib; };
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# Declarative libvirt domains. The disk image is a one-time copy (reflink) of
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# the VM's former KubeVirt disk, e.g.:
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# cp --reflink=auto /var/lib/rancher/k3s/storage/vms/<vm>-disk/disk.img \
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# /var/lib/libvirt/images/<vm>.img
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domains = {
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idols-kana = {
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uuid = "e744f563-7c7d-45e6-bc71-61980790208d";
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vcpu = 4;
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memoryGiB = 8;
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disk = "/var/lib/libvirt/images/idols-kana.img";
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mac = "52:54:00:5a:51:02";
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vncPort = 5902;
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};
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idols-ruby = {
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uuid = "3a959d02-11de-498d-bce7-85f78713ca63";
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vcpu = 4;
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memoryGiB = 8;
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disk = "/var/lib/libvirt/images/idols-ruby.img";
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mac = "52:54:00:5a:51:03";
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vncPort = 5903;
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};
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};
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in
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{
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# libvirt/QEMU -- runs the VMs directly instead of on KubeVirt. Used for the
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# VMs that need to feel like a real machine (the agent desktops kana/ruby) and
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# for Windows.
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virtualisation.libvirtd.enable = true;
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# The VMs attach to our existing bridge (br0), so allow it explicitly.
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virtualisation.libvirtd.allowedBridges = [ "br0" ];
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# Define (and autostart) the declarative domains on every activation.
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systemd.services.libvirt-define-domains = {
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description = "Define the declarative libvirt domains";
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after = [ "libvirtd.service" ];
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requires = [ "libvirtd.service" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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script = lib.concatStringsSep "\n" (
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lib.mapAttrsToList (name: args: ''
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${pkgs.libvirt}/bin/virsh define ${
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pkgs.writeText "libvirt-domain-${name}.xml" (genXml (args // { inherit name; }))
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}
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${pkgs.libvirt}/bin/virsh autostart ${name} || true
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'') domains
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);
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};
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# VM disk images (the declarative domains reference files here).
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systemd.tmpfiles.rules = [
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"d /var/lib/libvirt/images 0755 root root -"
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];
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}
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